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.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.course-card{position:relative;display:flex;min-height:330px;overflow:hidden;flex-direction:column;border:1px solid var(--lc-line);border-radius:24px;background:#fff;box-shadow:0 14px 36px rgba(65,84,126,.09);transition:.23s}.course-card:hover{transform:translateY(-5px);border-color:#b8b5ff;box-shadow:0 21px 50px rgba(65,84,126,.15)}.course-media{position:relative;height:178px;flex:0 0 178px;overflow:hidden;background:linear-gradient(145deg,#eeedff,#e4faff)}.course-media:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 52%,rgba(8,23,53,.32))}.course-media img{width:100%;height:100%;object-fit:cover;transition:transform .45s ease}.course-card:hover .course-media img{transform:scale(1.055)}.course-icon{position:absolute;z-index:1;left:17px;bottom:15px;display:grid;width:47px;height:47px;place-items:center;border:1px solid rgba(255,255,255,.78);border-radius:15px;background:rgba(255,255,255,.9);color:#09234a;font-size:22px;box-shadow:0 9px 24px rgba(9,35,74,.2);backdrop-filter:blur(8px)}.course-card-content{display:flex;min-height:150px;padding:19px 22px 20px;flex:1;flex-direction:column}.course-card h2{position:relative;margin:0;padding-right:22px;font-size:21px;line-height:1.16;letter-spacing:-.025em}.course-card-meta{display:flex;gap:7px;flex-wrap:wrap;margin-top:auto;padding-top:16px}.course-card-meta span{padding:6px 9px;border-radius:999px;background:#f1f5fb;color:#64748b;font-size:10px;font-weight:900}.course-card .course-arrow{position:absolute;right:20px;bottom:19px;color:#5146e5;font-size:22px;font-weight:900}
.course-hero-image{position:relative;overflow:hidden;min-height:280px;margin:24px 0;border-radius:30px;background:linear-gradient(135deg,#243b78,#6b46d9);box-shadow:var(--lc-shadow)}.course-hero-image img{width:100%;height:310px;object-fit:cover}.course-hero-image:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(9,20,53,.58),transparent 62%)}.course-hero-label{position:absolute;z-index:2;left:28px;bottom:28px;color:#fff}.course-hero-label span{display:block;font-size:12px;font-weight:900;text-transform:uppercase;letter-spacing:.08em}.course-hero-label b{display:block;max-width:650px;margin-top:7px;font-size:31px;line-height:1.05}
.unit-list{display:grid;gap:14px;margin-top:22px}.unit-card{overflow:hidden;border:1px solid var(--lc-line);border-radius:23px;background:#fff;box-shadow:0 13px 34px rgba(58,79,126,.08)}.unit-toggle{display:grid;width:100%;grid-template-columns:54px 1fr auto;gap:14px;align-items:center;padding:18px 20px;border:0;background:#fff;color:var(--lc-ink);text-align:left;cursor:pointer}.unit-index{display:grid;width:48px;height:48px;place-items:center;border-radius:15px;background:linear-gradient(145deg,#eeedff,#e6faff);color:#4b43ce;font-size:17px;font-weight:1000}.unit-title{font-weight:950;font-size:18px;line-height:1.3}.unit-count{color:#718099;font-size:12px;font-weight:850}.unit-chevron{font-size:22px;transition:transform .22s}.unit-card.open .unit-chevron{transform:rotate(180deg)}.unit-body{display:none;padding:0 20px 20px}.unit-card.open .unit-body{display:block}.topic-cloud{display:flex;gap:8px;flex-wrap:wrap;padding:18px;border-radius:18px;background:#f6f9fe}.topic-chip{display:inline-flex;align-items:center;gap:7px;padding:9px 12px;border:1px solid #dfe8f5;border-radius:999px;background:#fff;color:#4e5d74;font-size:12px;font-weight:800;transition:.18s}.topic-chip b{color:#5146e5}.topic-chip:hover{transform:translateY(-2px);border-color:#aaa6fb;color:#4038bd;box-shadow:0 8px 18px rgba(81,70,229,.10)}.unit-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:16px}.unit-source{color:#74839a;font-size:11px;font-weight:800}.test-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:45px;padding:0 16px;border-radius:14px;background:linear-gradient(120deg,#5146e5,#12bde7);color:#fff;font-size:13px;font-weight:950;box-shadow:0 12px 25px rgba(81,70,229,.22)}
.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start}.lesson-article{overflow:hidden;border:1px solid rgba(210,224,243,.95);border-radius:32px;background:rgba(255,255,255,.97);box-shadow:var(--lc-shadow)}.lesson-cover{position:relative;min-height:320px;overflow:hidden;background:linear-gradient(135deg,#263a79,#5943dc)}.lesson-cover img{width:100%;height:360px;object-fit:cover}.lesson-cover:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(9,20,53,.03),rgba(9,20,53,.88))}.lesson-cover-copy{position:absolute;z-index:2;right:clamp(22px,5vw,48px);bottom:clamp(22px,5vw,42px);left:clamp(22px,5vw,48px);color:#fff}.lesson-cover-copy span{font-size:12px;font-weight:950;letter-spacing:.08em;text-transform:uppercase}.lesson-cover-copy h1{max-width:850px;margin:10px 0 0;font-size:clamp(34px,5vw,59px);line-height:1.02;letter-spacing:-.045em}.lesson-content{padding:clamp(24px,5vw,54px)}.lesson-lead{margin:0 0 30px;padding:20px 22px;border-left:5px solid #5146e5;border-radius:0 17px 17px 0;background:#f1f2ff;color:#31405a;font-size:18px;font-weight:750;line-height:1.75}.lesson-section{padding:27px 0;border-top:1px solid #e5ecf6}.lesson-section:first-of-type{border-top:0}.lesson-section-kicker{display:inline-grid;width:36px;height:36px;place-items:center;margin-bottom:12px;border-radius:12px;background:linear-gradient(145deg,#5146e5,#12bde7);color:#fff;font-size:13px;font-weight:1000}.lesson-section h2{margin:0 0 13px;font-size:clamp(25px,3vw,34px);line-height:1.16;letter-spacing:-.028em}.lesson-section p{margin:0;color:#4e5f79;font-size:17px;line-height:1.92}.lesson-sidebar{position:sticky;top:105px;display:grid;gap:14px}.lesson-panel{padding:20px;border:1px solid #dbe6f4;border-radius:22px;background:rgba(255,255,255,.94);box-shadow:0 14px 36px rgba(58,79,126,.09)}.lesson-panel small{display:block;color:#7a889d;font-size:10px;font-weight:950;letter-spacing:.08em;text-transform:uppercase}.lesson-panel b{display:block;margin-top:7px;font-size:17px;line-height:1.35}.lesson-panel p{margin:10px 0 0;color:#687891;font-size:13px;line-height:1.65}.lesson-panel .test-button{width:100%;margin-top:15px}.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}.lesson-nav a{display:flex;min-height:76px;padding:15px 17px;justify-content:center;flex-direction:column;border:1px solid #dce6f4;border-radius:18px;background:#fff;color:#34435c;font-weight:900}.lesson-nav a:last-child{text-align:right}.lesson-nav span{display:block;margin-bottom:4px;color:#7b889d;font-size:10px;text-transform:uppercase;letter-spacing:.07em}.lesson-nav .is-empty{visibility:hidden}
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.confetti{position:fixed;z-index:1001;width:11px;height:18px;top:-24px;border-radius:3px;pointer-events:none;animation:confettiFall 2.1s linear forwards}@keyframes confettiFall{to{transform:translate3d(var(--drift),110vh,0) rotate(760deg);opacity:.35}}
.learning-ad{display:block;min-height:110px;margin:24px 0;padding:20px;border:1px solid #dce6f4;border-radius:20px;background:rgba(255,255,255,.82);text-align:center;overflow:hidden}.learning-ad>span{display:block;margin-bottom:8px;color:#8a96a8;font-size:9px;font-weight:900;letter-spacing:.12em;text-transform:uppercase}.learning-ad-sidebar{min-height:260px;margin:0}.lesson-content>.learning-ad{margin:28px 0}.learning-ad ins{max-width:100%}
@media(max-width:980px){.learning-hero-grid{grid-template-columns:1fr}.hero-visual{min-height:240px}.hero-visual img{max-height:280px}.grade-grid,.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.learning-toolbar{top:82px;grid-template-columns:1fr 190px}.free-pill{grid-column:1/-1;min-height:44px}.course-page-head{grid-template-columns:1fr}.course-badge{display:flex;gap:10px;min-height:auto;justify-content:flex-start}.lesson-layout{grid-template-columns:1fr}.lesson-sidebar{position:static;grid-template-columns:1fr 1fr}}
@media(max-width:640px){.wrap{width:min(100% - 20px,1220px)}.learning-main{padding-top:20px}.learning-hero{min-height:0;padding:28px 22px;border-radius:28px}.learning-hero h1{font-size:42px}.learning-hero p{font-size:16px}.hero-visual{min-height:200px}.hero-visual img{max-height:220px;border-radius:22px}.hero-stats{grid-template-columns:1fr 1fr}.learning-toolbar{position:relative;top:auto;grid-template-columns:1fr}.learning-toolbar .learning-select,.learning-toolbar .free-pill{grid-column:auto}.grade-grid,.course-grid{grid-template-columns:1fr}.grade-card{min-height:305px}.course-page-head h1{font-size:40px}.course-hero-image img{height:250px}.course-hero-label{left:20px;bottom:20px}.course-hero-label b{font-size:24px}.unit-toggle{grid-template-columns:45px 1fr auto;padding:15px}.unit-index{width:42px;height:42px}.unit-count{display:none}.unit-actions{align-items:stretch;flex-direction:column}.test-button{width:100%}.quiz-card{padding:22px;border-radius:25px}.quiz-option{padding:12px}.result-actions{display:grid}.result-actions a,.result-actions button{justify-content:center}.lesson-sidebar{grid-template-columns:1fr}.lesson-cover{min-height:270px}.lesson-cover img{height:310px}.lesson-content{padding:22px}.lesson-lead{font-size:16px}.lesson-section p{font-size:16px;line-height:1.82}.lesson-nav{grid-template-columns:1fr}.lesson-nav a:last-child{text-align:left}.lesson-nav .is-empty{display:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.grade-card,.course-card,.quiz-option{transition:none}.confetti{display:none}}
.quiz-stimulus{display:grid;gap:10px;margin:17px 0;padding:17px;border:1px solid #dbe5f4;border-radius:17px;background:linear-gradient(145deg,#f8faff,#effaff)}.quiz-stimulus[hidden]{display:none}.quiz-stimulus>b{color:#5047cd;font-size:10px;letter-spacing:.06em;text-transform:uppercase}.quiz-stimulus p{margin:0;color:#596a81;line-height:1.6}.quiz-data-table{display:grid;overflow:hidden;border:1px solid #d7e1ef;border-radius:13px;background:#fff}.quiz-data-table>div{display:grid;grid-template-columns:minmax(100px,.45fr) 1fr}.quiz-data-table>div>*{padding:10px 12px;border-bottom:1px solid #e5ebf4;font-size:12px}.quiz-data-table>div>*+*{border-left:1px solid #e5ebf4}.quiz-data-table>div:first-child{background:#172855;color:#fff}.quiz-data-table>div:last-child>*{border-bottom:0}@media(max-width:520px){.quiz-data-table>div{grid-template-columns:90px 1fr}.quiz-data-table>div>*{padding:9px 8px;font-size:11px}}